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3 years ago

The equation, DF + heat Imported Asset D + F, is an example of an endothermic reaction.

2 answers:

4 0

The answer is TRUE.

If the Energy is on the left, then the problem is true. If it is on the right then it would be negative, false, and considered as exothermic.

Endothermic reaction = the products are higher in energy than the reactants.
Exothermic reaction = a chemical reaction that releases energy by light or heat.

Readme [11.4K]3 years ago

4 0

Answer: It is true that the given example is an endothermic reaction.

Explanation:

Endothermic reaction is defined as the reaction in which reactant species absorb heat from the surrounding or from a source.

For example, $DF + Heat \rightarrow D + F$ is an endothermic reaction.

Energy of products is more than the energy of reactants in an endothermic reaction.

On the other hand, a reaction in which heat is released by reactant species is known as an exothermic reaction.

For example, $AB \rightarrow A + B + Heat$ is an exothermic reaction.

Energy of products is less than the energy of reactants in an exothermic reaction.

Hence, we can conclude that the given equation, $DF + Heat \rightarrow D + F$ , is an example of an endothermic reaction.

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lord [1]

Answer: A

Explanation:

8 0

3 years ago

Read 2 more answers

How much heat is added if 0.5137g of water increases in temperature by 0.871 degrees C?

UNO [17]

Answer:

1.87 J

Explanation:

q = c x m x (T2-T1)

c- specific heat of water (4.186 j/g.C)

q = 4.186 x 0.5137 x 0.871 = 1.87 J

8 0

3 years ago

Potassium forms ions with a charge of +1 (K+). Iodine forms ions with a charge of -1. Selenium forms ions with a charge of -2 (S

Taya2010 [7]

It is given that the charge on potassium is +1 i.e. Potassium is a cation, K⁺

The charge on selenium is given as -2, i.e. selenium is an anion, Se²⁻

The two ions are shown to combine to form a molecule: KXSeY where X and Y correspond to the proportions in which the two atoms combine.

Since the molecule is neutral, the positive and negative charges need to be balanced. This is possible only if 2 units of K⁺ combines with 1 unit of Se²⁻.

Therefore, the formula would be K₂Se

X = 2 and Y = 1

3 0

4 years ago

A 5.325g sample of methyl benzoate, a compound in perfumes , was found to contain 3.758 g of carbon, 0.316 g of hydrogen, and 1.

Alexxandr [17]

Answer: The empirical and molecular formula of the compound is $C_4H_4O$ and $C_8H_8O_2$ respectively

Explanation:

We are given:

Mass of C = 3.758 g

Mass of H = 0.316 g

Mass of O = 1.251 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Carbon = $\frac{\text{Given mass of Carbon}}{\text{Molar mass of Carbon}}=\frac{3.758g}{12g/mole}=0.313moles$

Moles of Hydrogen = $\frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{0.316g}{1g/mole}=0.316moles$

Moles of Oxygen = $\frac{\text{Given mass of oxygen}}{\text{Molar mass of oxygen}}=\frac{1.251g}{16g/mole}=0.078moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.078 moles.

For Carbon = $\frac{0.313}{0.078}=4.01\approx 4$

For Hydrogen = $\frac{0.316}{0.078}=4.05\approx 4$

For Oxygen = $\frac{0.078}{0.078}=1$

Step 3: Taking the mole ratio as their subscripts.

The ratio of C : H : O = 4 : 4 : 1

The empirical formula for the given compound is $C_4H_4O$

For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is:

$n=\frac{\text{Molecular mass}}{\text{Empirical mass}}$

We are given:

Mass of molecular formula = 130 g/mol

Mass of empirical formula = 68 g/mol

Putting values in above equation, we get:

$n=\frac{130g/mol}{68g/mol}=1.9\approx 2$

Multiplying this valency by the subscript of every element of empirical formula, we get:

$C_{(2\times 4)}H_{(2\times 4)}O_{(2\times 2)}=C_8H_8O_2$

Hence, the empirical and molecular formula of the compound is $C_4H_4O$ and $C_8H_8O_2$ respectively

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3 years ago

5. How does the abundance of isotopes of an element relate to its average atomic mass?

alukav5142 [94]

The average atomic mass of an element is the mass you see on a periodic table for that element. It is a weighted average of all the isotopes for that element based on the percentage of how much of an element is a specific isotope and the mass of each isotope. If an element has an abundance of isotopes, the isotopes with the highest and lowest masses may be more significantly different than the average atomic mass for elements with fewer isotopes.

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3 years ago